In the last half century or so, there has been a surge of interest in this type of endeavor, coming from a variety of directions. Some proposals, for example, entertain the notion that quantum theory might emerge from some (presumably more palatable) sub-quantum theory (see e.g., [1]}-[2]}). More recently, a wave of efforts have featured information theoretic concepts as unifying principles for quantum reconstruction [3]}-[4]}. In any case, a crucial choice must be made as to which principles, postulates, ideas, etc., must be regarded as sacred and immutable — this is the definitive step on the basis of which a reconstruction will live or die.
